I know this will be a very common comment on every topic dealing with Agile methods, but...
If you have a project manager in Scrum, you're not doing Scrum.
If you have sprints in Kanban, you're not doing Kanban.
If you have a project manager in Scrum, you're not doing Scrum.
If you have sprints in Kanban, you're not doing Kanban.
I don't think it has to. It can do that, since it's built for both Scrum and Kanban. But you don't have to use the Scrum facilities; if your workplace does, that's because someone there wants it to, and therefore has set up sprints and stuff in Jira.